Re: Can anyone explain(thro why am able to ping end to end with

Sanjoy

I believe that the explanation is that when they build the switch interface logic to support dot1x trunking, that they build in support to recognize and process the tagging, including the extra 4 bytes, without considering it a violation of the system MTU. This is very similar to the way that they support the Ethernet header and the FCS which make a frame actually 1518 without violating the System MTU of 1500.

Re: Can anyone explain(thro why am able to ping end to end with

As a workaround, you can enable a port for trunking in order to support baby giants. When you enable a port for 802.1q trunking, the switch automatically assumes that an extra four bytes of data are appended on, and increment the frame size of the L2 packet. Note that ISL encapsulation is not supported on these platforms.Hence, for implementations that require exactly one tag to be carried (either 802.1q or MPLS, but not both), you can configure the port as a trunk port to force the switchport to accept an extra four bytes of data. If the port were to carry multiple VLANs for VLAN-ID tagging or 802.1p prioritization, configure the port as a 802.1q trunk. However, even if VLAN tagging is not necessary, but you want the increased four-byte support, you can configure the port as a 802.1q trunk. Change the Native VLAN to be the one desired to carry

the traffic. When you do so, you can accommodate an extra four bytes of data

The ProblemEnter EVCsHow It Works (Ingress)How It Works
(Egress)Step-by-Step ExampleFinal Thoughts The ProblemOn traditional
switches whenever we have a trunk interface we use the VLAN tag to
demultiplex the VLANs. The switch needs to determine which MAC ...
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The ProblemEnter EVCsHow It Works (Ingress)How It Works
(Egress)Step-by-Step ExampleFinal Thoughts Introduction: Netdr is a tool
available on a RSP720, Sup720 or Sup32 that allows one to capture
packets on the RP or SP inband. The netdr command can be use...
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IntroductionOSPF, being a link-state protocol, allows for every router
in the network to know of every link and OSPF speaker in the entire
network. From this picture each router independently runs the Shortest
Path First (SPF) algorithm to determine the b...
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